A little request, in case it is possible to do, of course: it would be nice if CAT worked as the other catalogs in the calculator, at least keeping the last called label and second, having a quick access to a label by using the first characters of the item.

Both requests aren't easy to implement. The list of labels isn't at all a list, each label is searched for in its respective region. Moreover, the labels aren't in any particular order so that typing a letter will not find the next label starting with the letter(s) typed so far in alphabetical sequence. Saving the position might be possible but any update to the program will make it invalid. Today, you can select the region by typing its digit but the search will always start at the beginning.